Results 21 to 30 of about 447,630 (329)
, 2021 We survey old and new approaches to the study of symbolic powers of ideals. Our focus is on the symbolic Rees algebra of an ideal, viewed both as a tool to investigate its symbolic powers and as a source of challenging problems in its own right. We provide an invitation to this area of investigation by stating several open questions.
Grifo, Eloísa, Seceleanu, Alexandra
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Geochemical characteristics and mining prospects of REE in Lugou coal mine of Xinmi coalfield
矿业科学学报, 2020 The content of rare earth elements and their occurrence characteristics under low temperature ashing conditions in Lugou coal mine of Xinmi coalfield were studied by XRD, XRF and ICP-MS analysis techniques.The results show that the total content of rare ...
Luo Zhonggeng +3 more
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A Special Rare-earth Mineral —Eudialyte
Kuangchan zonghe liyong, 2023 This is an essay in the field of earth science, which mainly reviews the basic characteristics of eudialyte, a rare earth-containing mineral in alkaline rocks.
Wei Chen, Jiayun Zhou
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The signature of river- and wind-borne materials exported from Patagonia to the southern latitudes: a view from REEs and implications for paleoclimatic interpretations [PDF]
, 2004 Riverine and wind-borne materials transferred from Patagonia to the SW Atlantic exhibit a homogeneous rare earth element (REE) signature. They match well with the REE composition of Recent tephra from the Hudson volcano,and hence this implies a ...
Bidart, Susana M. +4 more
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GEOCHEMICAL HETEROGENEITY OF ESTONIAN GRAPTOLITE ARGILLITE; pp. 377–401 [PDF]
Oil Shale, 2013 This paper describes vertical fine-scale geochemical heterogeneity of Estonian graptolite argillite (GA). GA samples from Pakri and Saka outÂcrop sections were collected at 20 cm intervals for chemical analysis of major and trace elements, including ...
MARGUS VOOLMA +4 more
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Journal of Commutative Algebra, 2013 We study almost complete intersections ideals whose Rees algebras are extremal in the sense that some of their fundamental metrics---depth or relation type---have maximal or minimal values in the class. The focus is on those ideals that lead to almost Cohen--Macaulay algebras and our treatment is wholly concentrated on the nonlinear relations of the ...
Hong, Jooyoun +2 more
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Occurrence of rare earth element and yttrium (REY) in Tanjung formation coking coal from Sekako area, Central Kalimantan [PDF]
E3S Web of Conferences, 2020 Inorganic geochemistry of coal become a point of interest on coal study, especially relating with the occurrence of rare earth element. Tanjung Formation is one of coking coal bearing deposits in Barito Basin, Central Kalimantan.
Amijaya Hendra +2 more
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The impact of vegetation on fractionation of rare earth elements(REE) during water–rock interaction [PDF]
, 2006 Previous studies on waters of a streamlet in the Vosges mountains (eastern France) have shown that Sr and rare earth elements (REE) principally originate from apatite dissolution during weathering. However, stream water REE patterns normalized to apatite
Aubert, Dominique +7 more
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Записки Горного института, 2022 Data on the content and distribution of trace and rare-earth elements (SIMS method) in sectors and growth zones of a large zircon crystal from miaskite pegmatites of the Vishnegogorsky massif are presented.
Ekaterina V. Levashova +3 more
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